A simple function to check the version of Android devices.

whichAndroid.js

// whichAndroid()
//
// Checks the userAgent to see if it's an Android device and returns the version
// number if true. Returns false on all other browsers/devices.

let whichAndroid = function() {
  var userAgent = navigator.userAgent.toLowerCase();
  var check = userAgent.match(/android\s([0-9\.]*)/);
  return check ? check[1] : false;
};